UC2844N

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc2844n",
  "title": "UC2844N",
  "brief": "Texas Instruments AC-DC Controllers And Regulators, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "uc2844n",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC2844N",
    "manufacturer": "Texas Instruments",
    "package": "DIP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/cn/lit/gpn/uc3842",
    "parts": {
      "symbol": "uc2844n.kicad_sym",
      "footprint": "uc2844n.kicad_mod",
      "model_3d": "uc2844n-hero.glb",
      "model_3d_plain": "uc2844n.glb",
      "model_3d_step": "uc2844n-etched.step",
      "model_3d_step_plain": "uc2844n.step",
      "lbr": "uc2844n.lbr"
    },
    "distributor_links": {
      "lcsc": "C701459",
      "digikey": "296-27145-5-ND",
      "mouser": "595-UC2844N"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T18:50:33Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-27145-5-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-UC2844N",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output for external compensation; the error amplifier has internal current limiting, so forcing COMP to GROUND externally sets zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the internal error amplifier used to close the power converter voltage feedback loop; keep the lead short and stray capacitance low for stability, with a recommended input voltage of 2.5 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary-side current sense input to the PWM comparator, connected to the MOSFET current sense resistor; the recommended input voltage is 1 V, and an RC filter may be needed to avoid false triggering from leading-edge spikes."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Oscillator timing pin: RT connects from VREF and CT to GROUND to set fOSC = 1.72/(RT x CT); RT must never be less than 5 kΩ, and on UCx844 the switching frequency is half of fOSC."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog and power ground for this package (no separate PWRGND pin); keep the timing capacitor and bypass returns on a single point ground and separate the high-current gate driver return from the signal return."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Totem-pole gate driver for an external MOSFET, sourcing and sinking peak currents up to 1 A, and actively held low when VCC is below the turn-on threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply input for the analog controller and gate driver bias; total VCC current is the static current plus average OUTPUT current (IOUTPUT = Qg x fSW), and a bypass capacitor of typically 0.1 µF must be placed directly at this pin to GROUND."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5 V reference output that supplies the timing charging current and internal logic; it must be bypassed to GROUND with at least a 0.1 µF ceramic capacitor placed close to the pin, and external loads need additional bypassing."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet's pin-function table (Table 5-1) gives pin types as I/O/G, not KiCad ERC classes. I ma; The 8-pin PDIP (P) package is listed for UC2844N in the package option addendum, which matches the D"
        ],
        "pages_sent": 38,
        "cost_usd": 0.2151,
        "at": "2026-10-11T18:50:20"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/uc3842",
        "pages": 61,
        "sha256": "0f875fd24cbb5fda",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "uc2844n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc2844n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "da3b68b431ba29a4972b6cedd219cdffb28745381e7f5b9254c62c88ba82dcb3",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "DIP-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uc2844n"
  ],
  "discovery_pitch": "UC2844N (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc2844n.kicad_sym",
    "uc2844n.kicad_mod",
    "uc2844n.glb",
    "uc2844n.step",
    "uc2844n.lbr",
    "docs/hero.png",
    "docs/uc2844n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc2844n-hero.glb",
    "uc2844n-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}